With the lights on you can’t tell anything is there but turn on a UV light and the logo can be seen glowing.

At the upscale Intercontinental Hotel in New York City, Inside Edition left our fluorescent logo all over the bathroom. Then we checked out.

The next day, Inside Edition Chief Investigative Correspondent Lisa Guerrero checked into the same room under a different name.

When she flicked off the lights in the bathroom and turned on a UV light, only a small portion of the fluorescent gel could be seen on the sink counter. It appeared to have been cleaned well. We were off to a good start.

She then checked the toilet seat and found that the logo seemed to have been wiped but was still mostly there. As for the logo in the shower; it was never even touched.

Guerrero then called the manager to come up to the room.

“We found that this bathroom was not cleaned thoroughly, in particular the toilet seat and the shower floor,” Guerrero said.

“That's definitely unacceptable,” the manager admitted. “I apologize for that. That is definitely not the standard at the Intercontinental.”

A spokesperson for the Intercontinental Hotel told Inside Edition they have “rigorous cleaning protocols” and they take swift action on the rare occasion they get a complaint about room cleanliness. They also said our test damaged their toilet seat.

Of all the hotels Inside Edition checked, the dirtiest bathroom award goes to a Homewood Suites by Hilton in midtown Manhattan.

While the sink counter had been wiped clean, the toilet seat and shower were apparently never even touched.

Guerrero asked for a manager to come to the room.

When the manager surveyed the situation he said it could have been a mistake.

“Do you think housekeeping is doing a good enough job?" Guerrero asked.

“I do think they do an excellent job," said the manager. "It just could have been overlooked.”